There isn't a single, specific compound made from iron, sulfur, and oxygen. This is because these elements can combine in various ratios, resulting in different compounds with varying properties.

Here are some examples of compounds that could be formed from these elements:

* Iron(II) sulfate (FeSO₄): This compound contains iron in its +2 oxidation state and is commonly found in ferrous sulfate, used in fertilizers and water treatment.

* Iron(III) sulfate (Fe₂(SO₄)₃): This compound contains iron in its +3 oxidation state and is used in pigments, dyes, and water treatment.

* Iron(II) sulfide (FeS): This compound is commonly known as "iron pyrites," and is a common mineral found in nature.

* Iron(III) oxide (Fe₂O₃): Also known as "hematite," this compound is a primary source of iron and is found in various forms, like rust.

To determine the specific compound formed, you would need more information about the reaction conditions, such as the ratios of the elements used, the temperature, and the presence of other reagents.